Diffusively reflective film, method of manufacturing the same, light guiding module, backlight assembly, and liquid crystal display apparatus having the same

ABSTRACT

A diffusively reflective film includes a base film, a light reflection layer and a light diffusion layer. The base film is flexible. The light reflection layer is disposed on the base film. The light reflection film reflects a first light. The light diffusion layer is disposed on the light reflection layer. The light diffusion layer diffuses the first light to form a second light. The diffusively reflective film may be bent to cover the light guide plate without being broken so as to increase the amount of light. Thus, a display quality is enhanced. Further, the diffusively reflective film covers the first side face, the second side face and the first face of light guide plate at once. Thus, productivity is enhanced and its manufacturing cost is reduced.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application relies for priority upon Korean Patent Application No.2003-44571 filed on Jul. 2, 2003, the contents of which are hereinincorporated by reference in its entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a diffusively reflective film, a methodof manufacturing the diffusively reflective film, a light guidingmodule, a backlight assembly and a liquid crystal display apparatushaving the same, and more particularly to the diffusively reflectivefilm that is bendable, a method of manufacturing the diffusivelyreflective film, a light guiding module, a backlight assembly and aliquid crystal display apparatus having the same.

2. Description of the Related Art

Generally, a liquid crystal display apparatus displays an image vialiquid crystal molecules. The liquid crystal display apparatus includesa liquid crystal controlling part and a light providing part. The liquidcrystal controlling part controls an arrangement of liquid crystalmolecules so as to display an image. The light providing part providesthe liquid crystal controlling part with a light.

The light providing part influences a display quality. When a uniformityof light luminance is lowered, the display quality of the liquid crystaldisplay apparatus is deteriorated, regardless of the liquid crystalcontrolling part.

A general light providing part includes a lamp, a light guide plate,optical sheets and a light reflection plate.

The lamp generates light that is applied to the liquid crystalcontrolling part. A light emitting diode (LED) or a cold cathodefluorescent lamp (CCFL) may be used as the lamp.

The light guide plate has a plate-shape or a wedge-shape. The lightguide plate transforms a one-dimensional light into a two-dimensionallight.

The optical sheets enhance a luminance uniformity of light that exitsfrom the light guide plate. The optical sheets may include a diffusionsheet, a prism sheet, etc.

The reflection plate reflects light leaked from the light guide platetoward the light guide plate again.

An Enhanced Specular Reflection film (ESR film: trade mark of 3M) ismainly used as a reflection plate. The enhanced specular reflection filmis lightweight, thin and has a high reflectivity. However, the enhancedspecular reflection film is broken, when the enhanced specularreflection film is bent to form an angle above about 90°.

Recently, the reflection plate covers the light guide plate's faceexcept for a light exiting face of the light guide plate so as toenhance the luminance of the light.

Thus, in order to cover the faces of the light guide plate with theenhanced specular reflection film, the enhanced specular reflectionfilms corresponding to each face of the light guiding plate are cut outand attached on each face of the light guiding plate. That is becausethe enhanced specular reflection film is broken, when the specularreflection film is bent to form an angle that is above about 90°.

Thus, productivity decreases and a cost of manufacturing increases.

SUMMARY OF THE INVENTION

Accordingly, the present invention is provided to substantially obviateone or more problems due to limitations and disadvantages of the relatedart.

A diffusively reflective film that diffusively reflects light isprovided. The diffusive reflection is bendable without being broken.

In one aspect of the present invention, a method of manufacturing thediffusively reflective film is provided.

In another aspect of the present invention, a light guiding moduleincluding the diffusively reflective film is provided. The light guidingmodule enhances a luminance and a uniformity of light.

In another aspect of the present invention, a backlight assemblyincluding the diffusively reflective film is provided.

In another aspect of the present invention, a liquid crystal displaydevice including the diffusively reflective film is provided.

The diffusively reflective film includes a base film, a light reflectionlayer and a light diffusion layer. The base film is flexible. The lightreflection layer is disposed on the base film. The light reflection filmreflects a first light. The light diffusion layer is disposed on thelight reflection layer. The light diffusion layer diffuses the firstlight to form a second light.

According to the method of manufacturing the diffusively reflectivefilm, a light reflection layer is formed on a base film that isflexible. The light reflection layer reflects a first light. Then, alight diffusing layer is formed on the light reflection layer. The lightdiffusing layer diffuses the first light.

The light guiding module includes a light guide plate and a diffusivelyreflective film. The light guide plate transforms a first light having afirst light distribution into a second light having a second lightdistribution, so that the second light exits the light guide plate. Thediffusively reflective film covers a portion of the light guide plate todiffusively reflect a third light that leaks from the portion of thelight guide plate toward the light guide plate.

The backlight assembly includes a receiving container, a lamp, a lightguide plate and a diffusively reflective film. The lamp is disposed inthe receiving container. The lamp generates a first light having a firstlight distribution. The light guide plate is disposed in the receivingcontainer. The light guide plate transforms the first light into asecond light having a second light distribution. The diffusivelyreflective film is disposed in the receiving container. The diffusivelyreflective film diffusively reflects a third light that leaks from thelight guide plate toward the light guide plate.

The liquid crystal display apparatus includes a receiving container, alamp, a light guide plate, a diffusively reflective film and a liquidcrystal display panel. The lamp is disposed in the receiving container.The lamp generates a first light having a first light distribution. Thelight guide plate is disposed in the receiving container. The lightguide plate transforms the first light into a second light having asecond light distribution. The diffusively reflective film is disposedin the receiving container. The diffusively reflective film diffusivelyreflects a third light that leaks from the light guide plate toward thelight guide plate. The liquid crystal display panel transforms thesecond light into an image light containing image information.

According to the present invention, the diffusively reflective film maybe bent to cover the light guide plate without being broken so as toincrease the amount of light. Thus, a display quality is enhanced.

Further, the diffusively reflective film covers the first side face, thesecond side face and the first face of light guide plate at once. Thus,productivity is enhanced and its manufacturing cost is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features and advantage points of the presentinvention will become more apparent by describing exemplary embodimentsin detail thereof with reference to the accompanying drawings, in which:

FIG. 1 is a partially cut out perspective view showing a diffusivelyreflective film according to a first exemplary embodiment of the presentinvention;

FIG. 2 is an enlarged view of a portion ‘A’ of FIG. 1;

FIG. 3 is a schematic cross-sectional view showing a diffusivelyreflective film of FIG. 1;

FIG. 4 is a schematic cross-sectional view showing a diffusivelyreflective film according to a second exemplary embodiment of thepresent invention;

FIG. 5A is a schematic cross-sectional view showing a base film that isbendable according to a third exemplary embodiment of manufacturing adiffusively reflective film;

FIG. 5B is a schematic cross-sectional view showing a light reflectionlayer formed on a first face of the base body;

FIG. 5C is a schematic cross-sectional view showing a process of forminga light diffusion layer of FIG. 3;

FIG. 5D is a schematic cross-sectional view showing a process of forminga light diffusion layer of FIG. 4 according to a fourth exemplaryembodiment of manufacturing a diffusively reflective film;

FIG. 6 is an exploded perspective view showing a light guiding moduleaccording to a fifth exemplary embodiment of the present invention;

FIG. 7 is an enlarged view showing a portion ‘B’ of FIG. 6;

FIG. 8 is a schematic cross-sectional view showing a light guidingmodule of FIG. 6;

FIG. 9 is a schematic cross-sectional view showing a light guidingmodule according to a fourth embodiment of the present invention;

FIG. 10 is an exploded perspective view showing a light guiding moduleaccording to a sixth exemplary embodiment of the present invention;

FIG. 11 is a plan view showing a diffusively reflective film accordingto a seventh exemplary embodiment of the present invention;

FIG. 12 is an exploded perspective view showing a light guiding moduleemploying a diffusively reflective film of FIG. 11;

FIG. 13 is a schematic view of a backlight assembly according to aneighth exemplary embodiment of the present invention;

FIG. 14 is an exploded perspective view showing a backlight assembly ofFIG. 13;

FIG. 15 is an enlarged view of ‘C’ of FIG. 14;

FIG. 16 is an exploded perspective view showing a backlight assemblyaccording to a ninth exemplary embodiment of the present invention;

FIG. 17 is an exploded perspective view showing a backlight assemblyaccording to a tenth exemplary embodiment of the present invention; and

FIG. 18 is an exploded perspective view showing a backlight assemblyaccording to an eleventh exemplary embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter the preferred embodiment of the present invention will bedescribed in detail with reference to the accompanied drawings.

Embodiments of Diffusively Reflective Films Embodiment 1

FIG. 1 is a partially cut out perspective view showing a diffusivelyreflective film according to a first exemplary embodiment of the presentinvention, FIG. 2 is an enlarged view of a portion ‘A’ of FIG. 1, andFIG. 3 is a schematic cross-sectional view showing a diffusivelyreflective film of FIG. 1.

Referring to FIGS. 1 to 3, a diffusively reflective film 100 includes abase film 1 10, a light reflection layer 120 and a light diffusion layer130.

The base film 110 has a sheet-shape. The base film 110 includes sidefaces 114, a first face 115 and a second face 116. The first face 115faces with the second face 116.

The base film 110 is flexible. Thus, even when the base film 110 is bentto form an angle above 90°, the base film 110 is not broken. Forexample, the base film comprises polyethylene terephtahlate (PET).

The light reflection layer 120 is disposed on the first face 115 of thebase film 110. The light reflection layer 120 reflects a first light 10that is incident on the diffusively reflective film 100. The lightreflection layer 120 is not broken, even when the light reflection layer120 is bent to form an angle that is above 90°. The light reflectionlayer 120 may comprise a metal that is ductile.

The thickness of the light reflection layer 120 is about hundreds of nm.The light reflection layer 120 may comprise silver, aluminum (Al) oraluminum alloy. The silver, aluminum or aluminum alloy has a highreflectance and a high ductility. The light reflection layer 120 may beformed via a sputtering method or a vacuum plating.

The light diffusion layer 130 is disposed on the light reflection layer120. The light diffusion layer 130 diffuses the first light 10 reflectedon the light reflection layer 120 to form a second light 20 that exitsfrom the diffusively reflective film 100.

Beads 132 disposed on the light reflection layer 120 may form the lightdiffusive layer 130. The beads 132 may be attached on the lightreflection layer with an adhesive. A refractivity n_(b) of the beads 132is different with the refractivity n_(air) of air. Each of the beads 132may have a same size or a different size.

The first light 10 is diffused by the beads 132 to be formed the secondlight 20.

According to the first exemplary embodiment of the present invention,the light reflection layer 120 comprising a metal is formed on the basefilm 110 that is flexible.

The light diffusion layer 130 that diffuses the first light 10 reflectedon the light reflection layer 120 is formed on the light reflectionlayer 120. The light diffusion layer includes a plurality of beads 132.Thus, the diffusive reflection layer 100 diffusively reflects light, andmay be bendable according to a shape of other optical member such as alight guide plate.

Embodiment 2

FIG. 4 is a schematic cross-sectional view showing a diffusivelyreflective film according to a second exemplary embodiment of thepresent invention.

The diffusively reflective film is same as in Embodiment 1 except for alight diffusion layer 133. Thus, the same reference numerals will beused to refer to the same or like parts as those described in Embodiment3 and any further explanation will be omitted.

Referring to FIG. 4, the light diffusion layer 133 includes a pluralityof beads 133 and binder 134. The binder 134 has fluidity and viscosity.The beads 133 are mixed with the binder 134. The binder 134 may havedifferent refractivity with the beads 133 so as to enhance the diffusionof a light.

The beads 133 and the binder 134 are mixed and coat the light reflectionlayer 120. The beads 133 and the binder 134 diffuse a first light 10reflected on the light reflection layer 120.

According to the second exemplary embodiment of the present invention,the beads 133 and the binder 134 are mixed to form a light diffusionlayer 130. The light diffusion layer 130 diffuses the first light 10that is reflected on the light reflection layer 120. The beads 134 aretightly fixed with the light reflection layer 120 due to the binder 134.

Embodiments of a Method of Manufacturing a Diffusively Reflective FilmEmbodiment 3

FIG. 5A is a schematic cross-sectional view showing a base film that isbendable according to a third exemplary embodiment of manufacturing adiffusively reflective film.

Referring to FIG. 5A, a base film 110 comprises a polyethyleneterephtahlate (PET). The base film 110 has a sheet-shape of whichthickness is very thin. The base film 110 includes side faces 114, afirst face 115 and a second face 116. The base film 110 is not broken,even when the base film 110 is bend to form an angle above 90°.

FIG. 5B is a schematic cross-sectional view showing a light reflectionlayer formed on a first face of the base body.

Referring to FIG. 5B, the light reflection layer 120 is formed on thefirst face 115 of the base film 110. The light reflection layer 120comprises a metal that has ductility and reflectivity. The lightreflection layer 120 may comprises silver (Ag), aluminum (Al) or alloyof aluminum. The light reflection layer 120 may be formed on the firstface 115 of the base film 110 via a sputtering method or vacuum plating.The light reflection layer 120 has hundreds nm thickness, so that evenwhen the light reflection layer 120 is bent with the base film 110, thelight reflection layer 120 is not broken.

FIG. 5C is a schematic cross-sectional view showing a process of forminga light diffusion layer of FIG. 3.

Referring to FIG. 5C, a plurality of beads 132 is disposed on a face ofthe light reflection layer 120. An adhesive is coated on the face of thelight reflection layer 120.

A spreader 132 spreads the beads 132, so that the beads 132 are spreadon the face of the reflection layer 120 to form a light diffusion layer130. The beads 132 may form a multi-layered structure.

Then, an air is sprayed on the light diffusion layer 130 so as to drythe adhesive.

According to method of manufacturing the diffusively reflective film100, the light reflection layer 120 that comprises a metal is formed onthe base film 110. A plurality of beads 132 is attached on the lightreflection layer 120. The diffusively reflective film 100 diffusivelyreflects the first light 10. The diffusively reflective film 100 may bebent without being broken.

Embodiment 4

FIG. 5D is a schematic cross-sectional view showing a process of forminga light diffusion layer of FIG. 4 according to a fourth exemplaryembodiment of manufacturing a diffusively reflective film. The processof the present embodiment is the same as in Embodiment 3 except that alight diffusion layer of the present embodiment is different from thelight diffusion layer in Embodiment 3. Thus, the same reference numeralswill be used to refer to the same or like parts as those described inEmbodiment 3 and any further explanation will be omitted.

Referring to FIG. 5D, a light diffusion material is coated on the lightreflection layer 120 that is formed on the first face of the base film110. The light diffusion material includes beads 133 and a binder 134.The beads 133 may have a same size or a different size from each other.The binder 134 has a viscosity and an adhesive property. A refractivityof the binder 134 may be equal to that of the beads 133 or not.

A spreader 30 spreads uniformly the light reflection material disposedon the light reflection layer 120. Then, the light reflection materialis dried to form a light diffusion layer.

According to Embodiment 4, the light reflection material including thebinder 134 and the beads 133 is disposed on the light reflection layer120 and spread to be formed a light diffusion layer. Thus, thediffusively reflective film 100 is completed. The beads 134 are fixedtightly on the light reflection layer 120 due to the binder 134. Thebinder also diffuses the first light 10 to form a second light 20 thathas a uniform luminance.

Embodiments of Light Guiding Module Embodiment 5

FIG. 6 is an exploded perspective view showing a light guiding moduleaccording to a fifth exemplary embodiment of the present invention.

Referring to FIG. 6, a light guiding module 300 includes a light guideplate 200 and a diffusively reflective film 100.

The light guide plate 200 transforms a first light 40 that is azero-dimensional light or one-dimensional light into a second light 50that is a two-dimensional light.

The diffusively reflective film 100 reflects a third light 60 that isleaked from a portion of the light guide plate 200 toward the lightguide plate 200, and transforms the third light 60 into a fourth light70.

The diffusively reflective film 100 enwraps the portion of the lightguide plate 200 so as to prohibit the third light 60 from being leaked.

The light guide plate 200 includes a side face 225, a first face 230 anda second face 240.

The side face 225 includes a first side face 210 and a second side face220. The first light 40 enters the light guide plate 200 through thefirst side face 210.

The first face 230 reflects the first light 40 that enters the lightguide plate 200 through the first side face 210 toward the second face240.

The first face 230 may includes a plurality of dot patterns (not shown)so as to reflect the first light 40 effectively.

The second face 240 faces the first face 230. The first face 230 and thesecond face 240 are connected to the side face 225.

The second light 50 exits the light guide plate 200 via the second face240. A distribution of the second light 50 is different with that of thefirst light 40.

The diffusively reflective film 100 is disposed under the light guideplate 200, such that the diffusively reflective film 100 faces the firstface 230 of the light guide plate 200.

FIG. 7 is an enlarged view showing a portion ‘B’ of FIG. 6.

Referring to FIGS. 6 and 7, a diffusively reflective film 100 includes abase film 110, a light reflection layer 120 and a light diffusion layer130.

The base film 110 has a sheet-shape. The base film 110 comprises aflexible material, so that even when the base film 110 is bent to forman angle above 90°, the base film 110 is not broken. For example, thebase film 110 comprises polyethylene terephtahlate (PET).

The light reflection layer 120 is formed on the base film 110, such thatthe light reflection layer 120 faces the light guide plate 200. Thelight reflection layer 120 reflects the third light 60 that is leakedfrom the first face 230 of the light guide plate 200 toward the lightguide plate 200. The light reflection layer 120 comprises a metal thathas ductility, so that even when the light reflection layer 120 is bentto form an angle above 90°, the light reflection layer 120 is notbroken.

A thickness of the light reflection layer 120 is only hundreds of nm.The light reflection layer 120 may comprise silver (Ag), aluminum (Al)or aluminum alloy.

FIG. 8 is a schematic cross-sectional view showing a light guidingmodule of FIG. 6.

Referring to FIG. 8, the light diffusion layer 130 includes a pluralityof beads 132. The beads 132 may have same size or different size witheach other. The beads 132 are attached on the light reflection layer 120via an adhesive. The light diffusion layer 130 diffuses the third light60 that is reflected on the light reflection layer 120 to form thefourth light 70.

FIG. 9 is a schematic cross-sectional view showing a light guidingmodule according to a fourth embodiment of the present invention.

Referring to FIG. 9, the light diffusion layer 130 includes a binder 134and a plurality of beads 133. The binder 134 is mixed with the beads 133and coated on the light reflection layer 120. The beads 133 may havesame size or different size with each other. The beads 133 or the binder134 diffuse(s) the third light 60 to form the fourth light 70.

The diffusively reflective film 100 including the base film 110, thelight reflection layer 120 and the light diffusion layer 130 is disposedunder the light guide plate 200, such that the diffusively reflectivefilm 100 faces the first face 230 of the light guide plate 200.

Referring again to FIG. 6, the diffusively reflective film 100 includesa fixing part 150. A protrusion that protrudes from an edge of thediffusively reflective film 100 is bent to form the fixing part 150. Thefixing part 150 enwraps a portion of the side face 225 and the secondface 240.

According to Embodiment 5, the light guiding module 300 includes thelight guide plate 200 and the diffusively reflective film 100. The lightguide plate 200 transforms the first light 40 that is a zero-dimensionallight or a one-dimensional light into the second light 50 that istwo-dimensional light. The diffusively reflective film 100 diffusivelyreflects the third light 60 that is leaked from the light guide plate200 toward the light guide plate 200, so that the luminance is enhanced.

Embodiment 6

FIG. 10 is an exploded perspective view showing a light guiding moduleaccording to a sixth exemplary embodiment of the present invention.

The light guiding module is same as in Embodiment 5 except for adiffusively reflective film. Thus, the same reference numerals will beused to refer to the same or like parts as those described in Embodiment5 and any further explanation will be omitted.

Referring to FIG. 10, a diffusively reflective film 100 is bent to covera second side face 220 and a first face 230. The diffusively reflectivefilm 100 reflects a third light 60 that is leaked from the second sideface 220 or the first face 230 to transform the third light 60 into afourth light 70. The diffusively reflective film 100 does not cover afirst side face 210 of the light guide plate 200, so that the firstlight 40 may enter the light guide plate 200 through the first side face210.

A portion of the first light 40 that enters the light guide plate 200through the first side face 210 is leaked through the second side face220 or the first face 230 to form the third light 60. The diffusivelyreflective film 100 diffusively reflects the third light 60 toward thelight guide plate 200 to form the fourth light 70. The fourth light 70enters the light guide plate 200. Thus, an amount of the second light 50that exits from the light guide plate 200 increases.

Embodiment 7

FIG. 11 is a plan view showing a diffusively reflective film accordingto a seventh exemplary embodiment of the present invention, and FIG. 12is an exploded perspective view showing a light guiding module employinga diffusively reflective film of FIG. 11.

The light guiding module is same as in Embodiment 6 except for thediffusive reflective film. Thus, same reference numerals will be used torefer to the same or like parts as those described in Embodiment 6 andany further explanation will be omitted.

Only a diffusively reflective film is different in comparison withEmbodiment 6. Thus, the same reference numerals will be used to refer tothe same or like parts as those described in Embodiment 6.

Referring to FIGS. 11 and 12, a diffusively reflective film 100 covers afirst side face 210, a second side face 220 and a first face 230. Thus,the diffusively reflective film 100 diffusively reflects light thatleaks from the first side face 210, the second side face 220 or thefirst face 230 toward the light guide plate 200. A portion of thediffusively reflective film 100 corresponding to the first side face 210includes at least one opening 160, so that a first light 40 is allowedto enter the light guide plate 200 through the opening 160.

According to Embodiment 7, the first side face 210, the second side face220 and the first face 230 are covered with the diffusively reflectivefilm 100. The portion of the diffusively reflective film 100corresponding to the first side face includes the opening through whichthe first light 40 enters the light guide plate 200. Thus, the firstlight 40 does not leak from the light guide plate 200 to increase anamount of light exiting via the second face 240.

Embodiments of a Backlight Assembly Embodiment 8

FIG. 13 is a schematic view of a backlight assembly according to aneighth exemplary embodiment of the present invention, FIG. 14 is anexploded perspective view showing a backlight assembly of FIG. 13, andFIG. 15 is an enlarged view of a portion ‘C’ of FIG. 14.

Referring to FIGS. 13 to 15, a backlight assembly 500 includes areceiving container 400, a lamp 300, a light guide plate 200 and adiffusively reflective film 100. The backlight assembly 500 may furtherinclude optical sheets 510.

The receiving container 400 includes a first receiving container 410 anda second receiving container 420.

The first receiving container 410 has a rectangular frame shapeincluding an opening 405. The first receiving container may compriseplastics. The first receiving container 410 receives the lamp 300, thelight guide plate 200 and the diffusively reflective film 100, and itfixes them as well.

The second receiving container 420 is combined with the first receivingcontainer 410 to support the lamp 300, the light guide plate 200 and thediffusively reflective film 100. The second receiving container 420 maycomprise a metal.

The lamp 300 generates a first light 40. The first light 40 has a firstlight distribution. The lamp 300 may be a plurality of light emittingdiodes (LED) that generate a zero-dimensional light. The light emittingdiodes are disposed, such that the light emitting diodes are spacedapart with each other. A cold cathode fluorescent lamp (CCFL) thatgenerates a one-dimensional light may be used as the lamp 300.

The light guide plate 200 transforms the first light 40 that has a firstlight distribution into a second light 50 that has a second lightdistribution. A uniformity of the second light distribution is higherthan that of the first light distribution. For example, the light guideplate 200 transforms the first light 40 that has zero-dimensional lightinto the second light 50 that has two-dimensional light.

The light guide plate 200 includes a plurality of side faces 225, afirst face 230 and a second face 240.

The side faces 225 include a first side face 210 and a second side face220. The first light 40 enters the light guide plate 200 through thefirst side face 210.

The first face 230 is connected to the side faces 225, such that thefirst face 230 forms a right angle with respect to the side faces 225.

The first face 230 reflects the first light 40 that enters the lightguide plate 200 through the first side face 210 toward the second face240. The first face 230 may include a plurality of light reflection dotsso as to enhance a reflectivity.

The second face 240 is connected with the side faces 225, such that thesecond face 240 forms a right angle with respect to the side faces 225.Thus, the second face 240 faces the first face 230. The second light 50exits the light guide plate 200 through the second face 240.

Referring to FIG. 15, the diffusively reflective film 100 includes abase film 110, a light reflection layer 120 and a light diffusion layer130.

The base film 110 has a sheet shape. The base film 110 comprises aflexible material. Thus, even when the base film 110 is bent to form anangle above 90°, the base film 110 is not to be broken. For example, thebase film comprises polyethylenterephtahlate (PET).

The light reflection layer 120 is disposed on the base film 110, suchthat the light reflection layer 120 faces the first face 230 of thelight guide plate 200. The light reflection layer 120 reflects a thirdlight 60 that leaks from the first face 230 toward the light guide plate200. The light diffusion layer 130 diffuses the third light 60 to form afourth light 70. The light reflection layer 120 comprises a metal thathas ductility and a high reflectivity, so that the light reflectionlayer 120 is not broken, even when the light reflection layer 120 isbent to form an angle above 90°. For example, the light reflection layer120 may comprise silver (Ag), aluminum (Al) or an alloy of aluminum.

The light reflection layer 120 may be formed via a sputtering method ora vacuum plating.

The light diffusion layer 130 includes a binder 134 and a plurality ofbeads 133. The binder 134 has an adhesive property and a viscosity. Thebinder 134 is mixed with the beads 133 and spread to cover the lightreflection layer 120. A refractivity of the beads 134 is different withthat of air. The beads 134 may have same size, or different size witheach other.

The binder 134 or the beads 133 diffuse(s) the third light 60 that isreflected on the light reflection layer 120 to form the fourth light 70.

Referring again to FIG. 13, the optical sheets 510 are disposed on thesecond face 240 of the light guide plate 200. The optical sheets 510diffuse the second light 50 that exits from the light guide plate 200 toform a fifth light 520. The optical sheets 510 may include a diffusionsheet, a prism sheet, a protection sheet etc.

Embodiment 9

FIG. 16 is an exploded perspective view showing a backlight assemblyaccording to a ninth exemplary embodiment of the present invention.

The back light assembly is same as in Embodiment 8 except for adiffusively reflective film. Thus, the same reference numerals will beused to refer to the same or like parts as those described in Embodiment8 and any further explanation will be omitted.

Referring to FIG. 16, a diffusively reflective film 100 diffusivelyreflects a third light 60 that leaks from a second side face 220 or afirst face 230 toward a light guide plate 200. The diffusivelyreflective film 100 does not cover a first side face 210. Thus, a firstlight 40 generated from a lamp 300 may enter the light guide plate 200through the first side face 210.

According to Embodiment 9, the first light 40 generated from the lamp300 enters the light guide plate 200 through the first side face 210that is not covered with the diffusively reflective film 100. The thirdlight 60 which leaks from the second side face 220 or the first face 230is reflected by the diffusively reflective film 100 to form a fourthlight 70. The fourth light 70 re-enters the light guide plate 200 toincrease an amount of the second light 50 that exits the light guideplate through the second face 240 of the light guide plate 200.

Embodiment 10

FIG. 17 is an exploded perspective view showing a backlight assemblyaccording to a tenth exemplary embodiment of the present invention.

Only a diffusively reflective film is different in comparison withEmbodiment 9. Thus, the same reference numbers will be used to refer tothe same or like parts as those described in Embodiment 9.

Referring to FIG. 17, a diffusively reflective film 100 covers a firstside face 210, a second side face 220 and a first face 230 of the lightguide plate 200. Thus, the diffusively reflective film 100 reflectslight that leaks from the first side face 210, the second side face 220and the first face 230 toward the light guide plate 200. A portion ofthe diffusively reflective film 100, which corresponding to the firstside face 210, includes an opening 160. A first light 40 generated froma lamp 300 enters the light guide plate 200 via the first side face 210.

According to Embodiment 10, the diffusively reflective film 100 coversthe first side face 210, the second side face 220 and the first face230. That is, only the second face 240 is not covered with thediffusively reflective film 100. Thus, the first light that enters thelight guide plate 200 does not leak from the light guide plate 200 toincrease an amount of the second light 50 that exits the light guideplate 200 though the second face 240.

Embodiment of a Liquid Crystal Display Apparatus Embodiment 11

FIG. 18 is an exploded perspective view showing a backlight assemblyaccording to an eleventh exemplary embodiment of the present invention.

The backlight assembly is same as in Embodiment 10 except that the backlight assembly further comprises a liquid crystal display panel and achassis. Thus, the same reference numerals will be used to refer to thesame or like parts as those described in Embodiment 10 and any furtherexplanation will be omitted.

Referring to FIG. 18, a liquid crystal display apparatus 800 includes areceiving container 400, a diffusively reflective film 100, a lamp 300,a light guide plate 200, a liquid crystal display panel 600 and achassis 700.

The receiving container 400 receives the liquid crystal display panel600, such that the liquid crystal display panel faces the light guideplate 200.

The liquid crystal display panel 600 includes a thin film transistorsubstrate 610, a color filter substrate 620 and a liquid crystal layer630.

A plurality of pixel electrodes is arranged in a matrix shape. A thinfilm transistor (TFT) is electrically connected with the pixelelectrode. An image voltage is applied to the pixel electrode via thethin film transistor.

The color filter substrate 620 faces the thin film transistor substrate610. The color filter substrate 620 includes a common electrode.

A reference voltage is applied to the common electrode.

A liquid crystal layer 630 is interposed between the thin filmtransistor substrate 610 and the color filter substrate 620.

An arrangement of the liquid crystal layer 630 is changed due toelectric fields formed between the pixel electrode and the commonelectrode, so that a transmissivity of a second light 50 that exits fromthe light guide plate 200 and pass through optical sheets 510 isadjusted to display an image.

The chassis 700 is combined with the receiving container 400, so thatthe liquid crystal display panel 600 is supported. The chassis 700 maycomprise a metal to protect the liquid crystal display panel 600 that isfragile.

According to embodiments of the present invention, the diffusivelyreflective film may be bent to cover the light guide plate without beingbroken so as to increase the amount of light. Thus, a display quality isenhanced.

Further, the diffusively reflective film covers the first side face, thesecond side face and the first face of light guide plate at once. Thus,productivity is enhanced and its manufacturing cost is reduced.

Having described the exemplary embodiments of the present invention andits advantages, it is noted that various changes, substitutions andalterations can be made herein without departing from the spirit andscope of the invention as defined by appended claims.

1. A diffusively reflective film comprising: a base film that isflexible; a light reflection layer disposed on the base film, the lightreflection film reflecting a first light; and a light diffusion layerdisposed on the light reflection layer, the light diffusion layerdiffusing the first light to form a second light.
 2. The diffusivelyreflective film of claim 1, wherein the base film comprises polyethyleneterepthalate (PET).
 3. The diffusively reflective film of claim 1,wherein the light reflection layer comprises a metal.
 4. The diffusivelyreflective film of claim 3, wherein the metal is silver (Ag), aluminum(Al), or aluminum alloy.
 5. The diffusively reflective film of claim 1,wherein the light reflection layer comprises a plurality of beadsattached on the light reflection layer, the beads diffusing the firstlight to form the second light.
 6. The diffusively reflective film ofclaim 1, wherein the light diffusion layer comprises a binder and aplurality of beads, the binder being mixed with the beads and coated onthe light reflection layer, the binder and the beads diffusing the firstlight to form the second light.
 7. A method of manufacturing adiffusively reflective film comprising: forming a light reflection layeron a base film that is flexible, the light reflection layer reflecting afirst light; and forming a light diffusing layer on the light reflectionlayer, the light diffusing layer diffusing the first light.
 8. Themethod of claim 7, wherein the light reflection layer are formed bycoating a metal thin film on the base film.
 9. The method of claim 8,wherein the metal thin film is coated on the base film by a vacuumplating.
 10. The method of claim of claim 7, wherein the metal thin filmis coated on the base film by a sputtering method.
 11. The method ofclaim 7, wherein the light diffusion layer is formed via attaching aplurality of beads on the light reflection layer.
 12. The method ofclaim 7, wherein the light diffusion layer is formed via coating abinder that is mixed with a plurality of beads on the light reflectionlayer.
 13. A light guiding module comprising: a light guide plate thattransforms a first light having a first light distribution into a secondlight having a second light distribution, so that the second light exitsthe light guide plate; and a diffusively reflective film that covers aportion of the light guide plate to diffusively reflect a third lightthat leaks from the portion of the light guide plate toward the lightguide plate.
 14. The light guiding module of claim 13, wherein the lightguide plate comprises first and second side faces, and first and secondfaces, the first and second side faces connecting the first and secondfaces, such that the first and second faces face with each other, thefirst light entering the light guide plate via the first side face, thesecond light exiting the light guide plate via the second face.
 15. Thelight guiding module of claim 14, wherein the diffusively reflectivefilm is disposed under the light guide plate, such that the diffusivelyreflective film facing the first face of the light guiding plate. 16.The light guiding module of claim 14, wherein the diffusively reflectivefilm is bent to cover the first face and the second side face.
 17. Thelight guiding module of claim 14, wherein the diffusively reflectivefilm is bent to cover the first and second side faces and the firstface, a portion of the diffusively reflective film corresponding to thefirst side face, the portion of the diffusively reflective filmincluding an opening, the first light entering the light guide platethrough the opening.
 18. The light guiding module of claim 13, whereinthe diffusively reflective film comprises a base film that is flexible,a light reflection layer disposed on the base film, and a lightdiffusion layer that is disposed on the light reflection layer such thatthe light diffusion layer faces the light guide plate, a third lightthat leaks from the light guide plate being reflected on the lightreflection layer and diffused by the light diffusion layer to be formeda fourth light.
 19. The light guiding module of claim 18, wherein thelight reflection layer is a metal thin film, and the light reflectionlayer includes a plurality of beads diffusing the third light.
 20. Thelight guiding module of claim 18, wherein the light reflection layer isa metal thin film, and the light reflection layer includes a binder anda plurality of beads mixed with the binder, the binder and the beadsdiffusing the third light.
 21. A backlight assembly comprising: areceiving container; a lamp disposed in the receiving container, thelamp generating a first light having a first light distribution; a lightguide plate disposed in the receiving container, the light guide platetransforming the first light into a second light having a second lightdistribution; and a diffusively reflective film disposed in thereceiving container, the diffusively reflective film diffusivelyreflecting a third light that leaks from the light guide plate towardthe light guide plate.
 22. The backlight assembly of claim 21, whereinthe light guide plate comprises first and second side faces, and firstand second faces, the first and second side faces connecting the firstand second faces, such that the first and second faces face with eachother, the first light entering the light guide plate via the first sideface, the second light exiting the light guide plate via the secondface.
 23. The backlight assembly of claim 22, wherein the diffusivelyreflective film faces the first face of the light guide plate.
 24. Thebacklight assembly of claim 23, wherein the diffusively reflective filmis bent to cover the second side face and the first face of the lightguide plate.
 25. The backlight assembly of claim 24, wherein the lamp isa light emitting diodes, which are disposed to face the first side face.26. The backlight assembly of claim 22, wherein the diffusivelyreflective film is bent to cover the first and second side faces and thefirst face, a portion of the diffusively reflective film correspondingto the first side face, the portion of the diffusively reflective filmincluding an opening, the first light entering the light guide platethrough the opening.
 27. The backlight assembly of claim 26, wherein alight emitting diode (LED) that generates the first light is disposed inthe receiving container.
 28. The backlight assembly of claim 22, whereinthe diffusively reflective film comprises a base film that is flexible,a light reflection layer disposed on the base film, and a lightdiffusion layer disposed on the light reflection layer.
 29. A liquidcrystal display apparatus comprising: a receiving container; a lampdisposed in the receiving container, the lamp generating a first lighthaving a first light distribution; a light guide plate disposed in thereceiving container, the light guide plate transforming the first lightinto a second light having a second light distribution; a diffusivelyreflective film disposed in the receiving container, the diffusivelyreflective film diffusively reflects a third light that leaks from thelight guide plate toward the light guide plate; and a liquid crystaldisplay panel that transforms the second light into an image lightcontaining an image information.